EP0102749B1 - Faser bildende Polyester aus Ketodiolen - Google Patents

Faser bildende Polyester aus Ketodiolen Download PDF

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Publication number
EP0102749B1
EP0102749B1 EP83304377A EP83304377A EP0102749B1 EP 0102749 B1 EP0102749 B1 EP 0102749B1 EP 83304377 A EP83304377 A EP 83304377A EP 83304377 A EP83304377 A EP 83304377A EP 0102749 B1 EP0102749 B1 EP 0102749B1
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EP
European Patent Office
Prior art keywords
phenylene
ethylenedioxybis
independently selected
biphenylene
melt
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Expired
Application number
EP83304377A
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English (en)
French (fr)
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EP0102749A1 (de
Inventor
August Henry Frazer
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EIDP Inc
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EI Du Pont de Nemours and Co
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C08G63/19—Hydroxy compounds containing aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/68—Polyesters containing atoms other than carbon, hydrogen and oxygen
    • C08G63/682—Polyesters containing atoms other than carbon, hydrogen and oxygen containing halogens
    • C08G63/6824—Polyesters containing atoms other than carbon, hydrogen and oxygen containing halogens derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/6826—Dicarboxylic acids and dihydroxy compounds
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/78—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products
    • D01F6/84—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products from copolyesters

Definitions

  • This invention relates to fiber-forming, melt-spinnable polyesters that exhibit optical anisotropy in the melt.
  • Aromatic polyesters that form optically anisotropic melts and can be melt-spun into oriented filaments are disclosed in U.S. Patent 4,118,372.
  • the filaments can be heat treated to high tenacity and modulus.
  • the polyesters are prepared primarily from para-oriented dihydric aromatic compounds and para-oriented aromatic dicarboxylic acids.
  • the invention resides in homopolyesters consisting essentially of substantially equimolar amounts of the recurring units wherein
  • the invention also resides in copolyesters consisting essentially of the recurring units and wherein each of X 1 and Y 1 is independently selected from m-phenylene and p-phenylene; X 2 is Y 2 is each of X 3 , X 4 , X 6 , X 7 , Y 3 , Y 4 , Y 6 and Y 7 is independently selected from H, CH 3 and Cl;
  • the invention also resides in shaped articles of the aforesaid polyesters, including molded and extruded articles, examples of the latter being films and filaments.
  • a homopolyester is the condensation polymer prepared from one diol and one dicarboxylic acid
  • a copolyester is the condensation polymer prepared from a diol and a dicarboxylic acid and at least one additional diol and/or dicarboxylic acid.
  • the term "polyester” includes both homopolyester and copolyester.
  • the polyester includes the recited essential recurring units. This definition is not intended to preclude the presence of minor amounts (less than 10 mol%) of other recurring units of a nonessential type which do not deleteriously affect the properties, and particularly, the melt-anisotropic behavior, of the polyester.
  • the invention herein also resides in high modulus filaments of the above polyesters, for example, a modulus of greater than 200 g/denier (177 dN/tex), which filaments can be heat treated to high tenacity, for example, greater than 12 g/denier (10.7 dN/tex), and even higher modulus.
  • the polyesters of this invention are prepared by means of conventional procedures using appropriate mono or diketodiols and appropriate dicarboxylic acids.
  • the monoketodiol can be prepared by reacting, under anhydrous conditions, the appropriate R 3 /R 4 ⁇ , X 3 /X 4- or Y 3 /Y 4 -substituted phenol and the appropriate hydroxyacid (HO 2 C ⁇ R 2 ⁇ OH, HO 2 C ⁇ X 2 ⁇ OH or HO 2 C ⁇ Y 2 ⁇ OH) in hydrogen fluoride, in the presence of boron trifluoride, at a temperature in about the range 0-100°C.
  • the diketodiol can be similarly prepared by reacting the appropriate hydroxy acids of the formulas with the appropriate, aromatic hydrocarbon of the formula H ⁇ R 1 ⁇ H, or by reacting the appropriate monophenols of the formulas and H ⁇ R 2 ⁇ OH with the appropriate dicarboxylic acid of the formula HO 2 C ⁇ R 1 ⁇ CO 2 H, it being understood that, in all the aforesaid formulas, as is necessary to prepare the desired polyester, R', R 2 , R 3 and R 4 may be replaced with X 1 or Y 1 , X 2 or y2 , X 3 or Y 3 and X 4 or Y 4 , respectively.
  • the reaction can be conveniently carried out on an approximately molar scale, with the reactants being charged to a 1 L shaker tube (Hastalloy @ C) which is then cooled and evacuated. Liquid HF is added, then BF 3 in slight excess of such amount as to provide one mole for each mole of water produced and one mole for each mole of carbonyl functionality. The combined amounts of reactants, HF and BF 3 total about 700 g. The reaction time is generally about 4 to 18 hours. The product is discharged onto 2 L of ice (no water), then made up to 2.5 L with water and stirred vigorously.
  • the product is crystalline, it can be recovered by filtration; if it is not, sufficient methylene chloride is added to dissolve the product and, after pH adjustment to 7-8 with aqueous ammonia, the organic phase is separated from the aqueous phase and the product is recovered from the organic phase by evaporation.
  • Diols prepared by the above procedure can be conveniently purified by conversion to esters, preferably acetate esters, by treatment with the appropriate carboxylic acid anhydride, for example, acetic anhydride.
  • Acetylation of diols is accomplished with acetic anhydride, for example, 4 moles of acetic anhydride/mole of diol, in sufficient acetic acid to ensure adequate fluidity for stirring, for example, 1 to 2 L of acetic acid/mole of diol.
  • the reaction is conveniently run overnight at ambient temperature with acid catalysis, for example, 10 g of trifluoromethanesulfonic acid/mole of diol, or under reflux for 4 h with base catalysis, for example, 80 g of sodium acetate/mole of diol.
  • acid catalysis for example, 10 g of trifluoromethanesulfonic acid/mole of diol
  • base catalysis for example, 80 g of sodium acetate/mole of diol.
  • the base-catalyzed acetylation usually produces purer product.
  • the acid catalyst if present, is neutralized with sodium acetate, and the reaction mixture is diluted to twice its volume with ice and water. Product is isolated by filtration, washed with water, dried, and further purified by crystallization from an appropriate solvent.
  • polyesters of this invention are capable of forming optically anisotropic melts and exhibit molecular weights and melting points which permit melt-spinning into filaments at temperatures below 400°C.
  • Preferred polyesters of the invention have been melt-spun into filaments which have been heat- treated to increase strength properties.
  • the polyesters of the invention can be prepared by standard melt polymerization techniques from one or more aromatic dicarboxylic acids of the formula HO 2 C ⁇ R 5 ⁇ CO 2 H, wherein R 5 is defined as above, and one or more appropriate mono- or diketodiols, as defined above, frequently in the diester form, for example, the diacetate.
  • the diphenol and dicarboxylic acids are normally combined in substantially equimolar amounts and heated in a reaction vessel under nitrogen with stirring for about 4 to 24 hours. Temperatures employed for the polymerization (condensation) are above the melting points of the reactants and are generally in the range of 200° to 350°C.
  • the reaction vessel is equipped with means to permit by-product removal while polymerization takes place.
  • a vacuum is normally applied towards the end of the polymerization to facilitate removal of remaining by-products and to complete the polymerization.
  • Polymerization conditions such as temperature, duration of heating and pressure, can be varied, for example, in the light of the reactants employed and the degree of polymerization desired.
  • the polyesters can be spun into filaments by conventional melt-spinning techniques.
  • a melt of the polymer is extruded through a spinneret into a quenching atmosphere, for example, air or nitrogen maintained at room temperature, and wound up.
  • a quenching atmosphere for example, air or nitrogen maintained at room temperature, and wound up.
  • Such general spinning conditions are given, for example, in U.S. Patent 4,066,620.
  • fiber samples as skeins or on bobbins, preferably collapsible, Teflon@-coated, stainless-steel bobbins, are usually heated under various restraints in an oven that is continuously purged by flow of inert gas to remove by-products from the vicinity of the fiber. Temperatures approaching the fusion point, but sufficiently' below to prevent interfilament fusion, are employed. Preferably, the maximum temperature is reached in a stepwise fashion.
  • Inherent viscosity ( ⁇ inh ) is defined by the commonly used equation wherein ⁇ rel is the relative viscosity and C is the concentration of polymer in the solvent (0.5 g/dl).
  • the relative viscosity ( ⁇ rel ) is determined by dividing the flow time, in a capillary viscometer, of the dilute solution by the flow time, in the same capillary viscometer, for the pure solvent. Flow times are determined at 30°C, and the solvent is a mixture of, by weight, 7.5% trifluoroacetic acid, 17.5% methylene chloride, 12.5% dichlorotetrafluoroacetone hydrate, 12.5% perchloroethylene and 50% p-chlorophenol.
  • Fiber tensile properties are reported herein in conventional units, with the corresponding SI units in parentheses.
  • Measurements were made using established procedures, such as disclosed in U.S. Patent 3,827,998, on fibers that had been conditioned for at least one hour. At least three breaks were averaged.
  • the commonly used Thermooptical Test (TOT) as described, for example, is U.S. Patent 4,066,620, was used and involves heating a polymer sample between crossed (90°) polarizers on the heating stage of a polarizing microscope. Polymers that pass this test (+) are considered to be optically anisotropic in the molten state.
  • the orientation angle was determined according to established procedures, such as disclosed in U.S. Patent 3,671,542.
  • Examples 1A, 1B and 3B include comparative experiments which are outside the invention and which demonstrate that the properties, and particularly melt-anisotropic behavior, of polyesters are not predictable from a consideration of the diester and diacid reactants used to prepare them.
  • Homopolyesters A-C shown in Table 1 B and comparative homopolyesters S1 and S2 were prepared using the following procedures. To a glass reactor equipped with a nitrogen inlet and sidearm were added the reactants shown in Table 3. The mixture was heated under a nitrogen atmosphere for about 8 h at 283°, removed from the reactor and ground in a Wiley mill at liquid nitrogen temperature until the particles passed through a 20 mesh (U.S. Sieve Series) screen, and then reheated for 8 h at 283°.
  • Preparation A was repeated except that isophthalic acid was used in place of terephthalic acid; Preparation A was repeated except that 3-chloro-4,4'-diacetoxybenzophenone was used in place of 3,5-dichloro-4-4'-diacetoxybenzophenone; and Preparation B was repeated except that 3,3',5,5'-tetrachloro-4,4'-diacetoxybenzophenone was used in place of 3,5-dichloro-4,4'-diacetoxybenzophenone.
  • the three homopolyesters so produced failed the TOT test (-) and are outside the invention since they fail to meet the requirements of homopolyester proviso (aa).
  • Copolyester E shown in Table 2B was prepared as described in Part A hereinabove except that the diester used was a 1:1 (molar) mixture of 3,3',5,5'-tetrachloro-4,4'-diacetoxybenzophenone (1.090 g) and 4,4'-diacetoxybenzophenone (0.745 g) and the diacid used was isophthalic acid (0.730 g).
  • the resulting polymer passed the TOT test (+); the properties are given in Table 4.
  • Preparation E was repeated three times except that terephthalic acid, ethylenedioxybis-p-benzoic acid and 4,4'-bibenzoic acid, respectively, were used in place of isophthalic acid.
  • the three copolyesters so produced failed the TOT test (-) and are outside the invention since they fail to meet the requirements of copolyester proviso (cc).
  • Homopolyester preparations A to C and S1 and S2 and copolyester preparation E were mechanically melt spun, using spinnerets having a single 0.23 mm diameter hole, at spinneret temperatures of 298° to 355°, and the fibers were wound up at speeds of 400 to 1070 m/min; data are given in Table 5A. Tensile properties of single filaments of these fibers were measured at room temperature, as-spun, and after heat treatment on a bobbin, under restraint, in a nitrogen atmosphere at 205° to 300°C for periods of up to 24 h. Property data are given in Table 5B; the data represent the average of five 2.54 cm breaks. In Table 6 are given the best single-break values obtained after heat-treatment of the same filaments of homopolyesters A-C and copolyester E.
  • Copolyesters F-N shown in Table 2B were prepared by the procedure described in Example 1 B except that the reactants used were as shown in Table 7. In each preparation two diols in the form of diacetates were used in a molar ratio of 1:1. The resulting polymers had the properties given in Table 8; all passed the TOT test (+).
  • Copolyesters S-W shown in Table 2A were prepared by the procedure described in Example 1B except that the reactants used were as shown in Table 11. In each preparation two diols in the form of diacetates were used in a molar ratio of 1:1. The resulting polymers had the properties given in Table 12; all passed the TOT test (+).
  • Preparation S was repeated two times except that terephthalic acid and ethylenedioxybis-p-benzoic acid, respectively, were used in place of 4,4'-bibenzoic acid; and Preparation S was repeated except that 1,3-bis(3-methyl-4-acetoxybenzoyl)benzene was used in place of 1,3-bis(3,5-dimethyl-4-acetoxybenzoyl)benzene.
  • the three copolyesters so produced failed the TOT test (-) and are outside the invention since they fail to meet the requirements of copolyester proviso (gg).
  • polyesters of high tenacity and modulus are well known in the textile industry.
  • the polyesters of this invention are especially useful in this industry.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Artificial Filaments (AREA)

Claims (14)

1. Faserbildender schmelz-verspinnbarer Polyester, der in der Schmelze optisch anisotrop ist und im wesentlichen besteht aus:
A. im wesentlichen äquimolaren Mengen der wiederkehrenden Einheiten
Figure imgb0045
worin
R1 m-Phenylen oder p-Phenylen ist;
R2
Figure imgb0046
ist;
jedes von R3, R4, R6 und R7 unabhängig ausgewählt ist aus H, CH3 und Cl;
R5 m-Phenylen, p-Phenylen, Ethylendioxybis-p-Phenylen oder p,p'-Biphenylen ist; und
n 0 oder 1 ist;
jedoch mit der Massgabe, dass
(aa) wenn n 0 ist, dann R2
Figure imgb0047
ist; R3 und R4 oder R6 und R7 beide CI sind und R5 p-Phenylen oder Ethylendioxybis-p-phenylen oder R2
Figure imgb0048
ist; R3, R4, R6 und R7 H sind und R5 Ethylendioxybis-p-phenylen ist; und
(bb) wenn n 1 ist, dann R1 m-Phenylen ist, R2
Figure imgb0049
ist, R5 Ethylendioxybis-p-phenylen oder p,p'-Biphenylen ist, eines von R3 und R4 CH3 oder CI ist und das andere H ist und eines von R6 und R7 CH3 oder CI ist und das andere H ist; oder
B. den wiederkehrenden Einheiten
Figure imgb0050
und
Figure imgb0051
worin jedes von X' und Y1 unabhängig voneinander ausgewählt ist aus m-Phenylen und p-Phenylen; X2
Figure imgb0052
ist, y2
Figure imgb0053
ist,
jedes von X3, X4, X6, X7, Y3, Y4, Y6 und Y7 unabhängig voneinander ausgewählt ist aus H, CH3 und CI;
R5 m-Phenylen, p-Phenylen, Ethylendioxybis-p-phenylen oder p,p'-Biphenylen ist; und n 0 oder 1 ist,

wobei jede der wiederkehrenden Einheiten (i) und (ii) 40 bis 60 Mol-% ihrer vereinigten Mengen ausmacht, welche im wesentlichen äquimolar mit der Menge an (b) ist, jedoch mit der Massbage, dass
(aa) wenn n 0 ist und eines von X2 und Y2 an den p-Phenylen-Stellungen angebunden ist und das andere an die m-Phenylen-Stellungen angebunden ist, dann X3, X4, X6, X7, Y3, Y4, Y6 und Y7 H sind und R5 p-Phenylen oder Ethylendioxybis-p-phenylen ist;
(bb) wenn n 0 ist und X2 und Y2 beide an die p-Phenylen-Stellungen angebunden sind, 1 oder 2 von X3, X4, X6 und X7 und 1 oder 2 von Y3, Y4, Y6 und Y7 unabhängig voneinander ausgewählt sind aus CH3 und CI, dann die verbleibenden 2 oder 3 von X3, X4, X6 und X7 und die verbleibenden 2 oder 3 von Y3, Y4, Y6 und Y7 H sind und R5 m-Phenylen, p-Phenylen oder Ethylendioxybis-p-phenylen ist;
(cc) wenn n 0 ist, X2 und Y2 beide an die p-Phenylen-Stellungen angebunden sind und jedes X3, X4, X6 und X7 unabhängig voneinander ausgewählt sind aus CH3 und Cl und Y3, Y4, Y6 und Y7 H sind oder X3, X4, X6 und X7 H sind und Y3, Y4, Y6 und Y7 unabhängig voneinander ausgewählt sind aus CH3 und CI, dann R5 m-Phenylen ist;
(dd) wenn n 0 ist und X2 und Y2 beide an die m-Phenylen-Stellungen gebunden sind, 1 oder 2 von X3, X4, X6, X7, Y3, Y4, Y6 und Y7 unabhängig voneinander ausgewählt sind aus CH3 und CI, die verbleibenden 6 oder 7 aus X3, X4, X6, X7, Y3, Y4, Y6 und Y7 H sind und R5 p-Phenylen oder Ethylendioxybis-p-phenylen ist;
(ee) wenn n 1 ist, X2
Figure imgb0054
ist;
(ff) wenn n 1 ist und X1 und Y1 beide m-Phenylen sind, 6 aus X3, X4, X6, X7, Y3, Y4, Y6 und Y7 unabhängig voneinander ausgewählt sind aus CH3 und CI, die verbleibenden 2 aus X3, X4, X6, X7, Y3, Y4, Y6 und Y7 H sind und R5 p,p'-Biphenylen ist; und
(gg) wenn n 1 ist und eines aus X1 und Y1 m-Phenylen ist und das andere p-Phenylen ist, jedes aus X3, X4, X6, X7, Y3, Y4, Y6 und Y7 unabhängig voneinander aus CH3 und CI ausgewählt ist oder eines aus jedem Paar X3 und X4, X6 und X7, Y3 und Y4 und Y6 und Y7 unabhängig voneinander ausgewählt ist aus CH3 und Cl und das andere von jedem Paar H ist und R5 p,p'-Biphenylen ist.
2. Homopolyester nach Anspruch 1.
3. Homopolyester nach Anspruch 2, worin
n 0 ist,
R2
Figure imgb0055
ist,
R3 und R4 beide Cl sind,
R5 p-Phenylen ist und
R6 und R7 beide H sind.
4. Homopolyester nach Anspruch 2, worin
n 0 ist,
R2
Figure imgb0056
ist,
R3 und R4 beide Cl sind,
R5 Ethylendioxybis-p-phenylen ist und
R6 und R' beide H sind.
5. Homopolyester nach Anspruch 2, worin
n 0 ist,
R2
Figure imgb0057
ist,
R3, R4, R6 und R7 H sind und
R5 Ethylendioxybis-p-phenylen ist.
6. Copolyester nach Anspruch 1.
7. Copolyester nach Anspruch 6, worin
n 0 ist,
X2
Figure imgb0058
ist,
X3, X4, X6 und X7 H sind,
y2
Figure imgb0059
ist,
Y3, Y4, Y6 und Y7 CI sind und
R5 m-Phenylen ist.
8. Copolyester nach Anspruch 6, worin
n 0 ist,
X 2
Figure imgb0060
ist,
X 3, X 4, X6 und X7 H sind,
Y2
Figure imgb0061
ist,
Y3, Y4, Y6 und Y7 CH3 sind und
R5 m-Phenylen ist.
9. Geformter Gegenstand aus Polyester nach einem der Ansprüche 1 bis 8.
10. Formteil aus einem Polyester nach einem der Ansprüche 1 bis 8.
11. Extrudierter Gegenstand aus einem Polyester nach einem der Ansprüche 1 bis 8.
12. Folie aus einem Polyester nach einem der Ansprüche 1 bis 8.
13. Filament aus einem Polyester nach einem der Ansprüche 1 bis 8.
14. Filament aus einem Polyester nach einem der Ansprüche 3, 5 und 7.
EP83304377A 1982-07-29 1983-07-28 Faser bildende Polyester aus Ketodiolen Expired EP0102749B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/402,858 US4399270A (en) 1982-07-29 1982-07-29 Fiber-forming polyesters of ketodiols
US402858 1982-07-29

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EP0102749A1 EP0102749A1 (de) 1984-03-14
EP0102749B1 true EP0102749B1 (de) 1987-04-29

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EP (1) EP0102749B1 (de)
JP (1) JPS5951914A (de)
CA (1) CA1192337A (de)
DE (1) DE3371210D1 (de)

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US4500699A (en) * 1984-06-26 1985-02-19 E. I. Du Pont De Nemours And Company Optically anisotropic melt forming copolyesters
US4703102A (en) * 1984-07-19 1987-10-27 Asahi Kasei Kogyo Kabushiki Kaisha Aromatic polyether ketones
JPH0726250B2 (ja) * 1986-03-27 1995-03-22 住友化学工業株式会社 ポリエステル繊維

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US4232143A (en) * 1979-09-17 1980-11-04 E. I. Du Pont De Nemours And Company Polyester which exhibits anisotropy in the melt containing p-oxybenzoyl units and 4,4'-dioxybenzophenone units or methyl and chloro derivatives thereof
US4269965A (en) * 1979-09-17 1981-05-26 E. I. Du Pont De Nemours And Company Aromatic polyester which forms optically anisotropic melts and filaments thereof
US4232144A (en) * 1979-09-17 1980-11-04 E. I. Du Pont De Nemours And Company Polyester which exhibits anisotropy in the melt containing p-oxybenzoyl units and 4-oxy-3'-carbonylbenzophenone units or methyl and chloro derivatives of said units
US4321355A (en) * 1980-09-23 1982-03-23 Union Carbide Corporation Process for preparing polyarylates
US4335232A (en) * 1981-07-07 1982-06-15 E. I. Du Pont De Nemours And Company Optically anisotropic melt forming polyesters

Also Published As

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EP0102749A1 (de) 1984-03-14
DE3371210D1 (en) 1987-06-04
US4399270A (en) 1983-08-16
JPS5951914A (ja) 1984-03-26
CA1192337A (en) 1985-08-20

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